Webster's English Dictionary

Enter the word to look up:

caliber

cal.i.ber or cal.i.bre \'kal-*-b*r\ n [MF calibre, fr. OIt calibro, fr. Ar 
   qa-lib shoemaker's la]st 1a: the diameter of a bullet or other projectile  
   1b: the diameter of a bore (as of a cannon or other firearm)  2: the 
   diameter of a round body; esp : the internal diameter of a h ollow cylinder 
   3a: degree of mental capacity or moral quality  3b: degree of excellence or 
   importance : QUALITY